Good Questions: Unique Chairs for our Table?

We bought a modern table (white and chrome) that came with matching chairs. I would like to replace the current chairs and have 4 unique chairs instead. What is the secret to getting this look right? I've seem some do it and have it look amazing, while others fall short. Every other bit of furniture in our living/dining area is white (and modern), with the exception of an old leather club chair (in brown) and the walls are painted a very pale silver with dark charcoal gray in the dormers. We do have bright primary colors in small doses via pop art, pillows, etc.